Data Sheet

Technical Data Sheet
Terostat MS 939
18 August-2009
PRODUCT DESCRIPTION
Terostat MS 939 provides the following product
characteristics:
Technology Silane modified polymer
Product Type Adhesive/Sealant
Components One-component
Cure Humidity
Application Assembly
Appearance White, Off-white, Grey, Black
Consistency Pasty, Thixotropic
Odor Characteristic
Terostat MS 939 is a gun-grade, one-component sealant
based on silane modified polymers, which cures by reaction
with moisture to an elastic product. The skin formation and
curing times are dependent on humidity and temperature, and
the curing time also depends on joint depth. By increasing the
temperature and moisture these times can be reduced; low
temperature as well as low moisture retard the process.
Terostat MS 939 is particularly sag-resistant leading to a high
position tack after matching of the parts to be bonded.
Terostat MS 939 is free of solvents, isocyanates, silicones
and PVC. It demonstrates good adhesion to many substrates
and is compatible with suitable paint systems. The sealant
also demonstrates good UV resistance and can therefore be
used for interior and exterior applications. Terostat MS 939
demonstrates the strength necessary for elastic bonding. This
property of the product also remains at the temperatures in
repair ovens (max. 100°C). Terostat MS 939 shows no
shrinkage, and therefore dimpling and tension stress are not
observed under these conditions. Terostat MS 939 allows
accelerated curing as two-component material. See separate
data sheets Terostat MS Power & Speed Technology or
Terostat MS 2c-Technology.
Application Areas:
Terostat MS 939 is used for the following applications: elastic
bonding of metals and plastics, e.g. side panelling and
bonding of the roof skin in the vehicle and caravan
manufacture.elastic, interior and/or exterior seam and joint
sealing in the following areas. vehicle body, caravan, railway
carriage, container and general metal construction;
the electrical, plastics, air- conditioning and ventilation
industries
TECHNICAL DATA
Density, g/cm³, white, grey: approx. 1.5
Density, g/cm³, off-white: approx. 1.45
Density, g/cm³, black: approx. 1.45
Sag resistance: no sagging (DIN
profile 15 mm)
Skin formation time, min*: approx. 10
Cure rate, mm/24 hrs: approx. 3
Shore-A-hardness (ISO 868, Durometer A): approx. 55
Tensile strength (acc. to ISO 37), MPa: approx. 3.0
Elongation at break (acc. to ISO 37,
speed 200 mm/min),%:
approx. 250
Stress at 100 % elongation
(acc. to ISO 37), MPa:
approx. 1.6
Volume change (acc. to DIN 52451), %: <2
Paint compatibility: in principle
compatible
UV resistance: no signif. changes
UV source: Osram
Vitalux 300W,
dry UV
Distance to the specimen, cm: 25
Test period, weeks: 6
QUV resistance: no signif. changes
QUV source: QUV
weatherometer acc.
to DIN 53384-A
Test period, weeks: 6
Reference IEC 61215/61646 clause 10.13:
Damp heat test durability **: given
Test period, hours: 1,000
Application temperature, °C: 5 to 40
In service temperature range, °C: -40 to +100
Short exposure (up to 1 h), °C: 120
* ISO 291 standard climate: 23°C, 50% relative
air humidity
**Damp heat conditions: 85°C, 85% relative
air humidity
Certificates and Approvals
- approved to UL (Underwriters Laboratories) "Polymeric
Adhesive Systems, Electrical Equipment - Component"; File:
QOQW2.MH27655
DIRECTIONS OF USE
Preliminary statement:
Prior to application it is necessary to read the Material Safety
Data Sheet for information about precautionary measures
and safety recommendations. Also, for chemical products
exempt from compulsory labeling, the relevant precautions
should always be observed.
______________________________________________________________________________________________________
Henkel AG & Co.KGaA
40191 Düsseldorf. Germany
Phone: [phone]
www.henkel.com